Resilient mounting for the stylus holder of talking machines



Dec. 18, 1928. 1,695,418

J. DURHAM RESILIENT MOUNTING FOR THE STYLUS HOLDER OF TALKING MACHINES Filed Sept. 25, 1924 Patented Dec. 18, 1928.

UNITED S -res rENr-o- F1cE.*

Josnrn DURHAM, or ROZELLE, mania sYnNnY, em sonrn warns, AUSTRALIA.

RESILIENT MOUNTING FOR THE STYLUS HOLDER OF TALKING MACHINES. I

Original application filed. April 17, 1923, Serial No. 632,646, and in Australia Octoberv 14, 1922.

Divided and this application filed SSeptemher 23, 1924. Serial No. 739,356. I

This invention relates to an improved resilient and adjustable mounting for the stylus-holder of a talking machine, and it is a division of my United States patent application Serial No. 632,646, filed 17th April, 1923, which matured into Pat. No. 1,569,317 dated Jan. 12, 1926.

An object of the invention is to improve reproduction and obtain clearer tone, especially inthecaseof records that have been frequently used, and have developed a tendency to blast whilst being played in the machine.

The improved mounting for the stylusholder comprises a U-shaped member,- having two spring arms, the end portions of which are pivotally engaged by adjustable pivots carried by lugs that are formed on the sound-box of the machine. These lugs may be split and furnished with looking screws, whereby the pivots are retained in selected adjusted positions relatively to the arms of the U-shaped spring.

In the accompanying drawings Figure 1 is a view illustrating the soundbox of a talking machine fitted with the improved resilient mounting for the sty1usholder.

' Figure 2 is an enlarged View, partly insection, clearly showing the stylus-holder and its resilient mounting.

Figure 3 is a central sectional View through the stylus-holder. r v

Figure at is a view illustrating a construction, wherein the styhis-holder is soundinsulated from the sound-box.

Figure 5 is a view showing modified means for adjusting the tension of the spring arms.

In these views, 5 designates the sound-box of a talking machine, 6 the diaphragm, 7 the stylus-bar, 8 the stylus-holder, and 9 the stylus, which is detachably secured in position in customary manner by a screw 10.

A U-shaped spring 11' is afiixed at itsbaso portion by brazing or like means to the outer end of the stylus-holder 8, and it has a hole 12 accommodating a neck 13 formed at the outer socketed end of the stylus-holdersee Fi ure 3 of the drawings.

The arms of the U-shaped spring 11 are inclined slightly outwardly and they extend upwardly on opposite sides of the stylusholder 8 having their end portions accommodated in a recess provided between two split lugs 1d,that are formed marginally on the sound-box 5. Locking screws 15 are adapted to close the split portionsof said lugs, while adjustable pivot screws 16 are passed through said lugs in a direction at right angles to said locking screws, and they have pointed ends which are maintained in pivotal engagement with the end portions of the arms of the U-shaped spring 11.

The tension of the spring arms can thus be easily regulated, when desired, by loosening the locking screws 15 so as to cause the split lugs 14 to open sufliciently to permit ready adjustment of the pivot screws 16, when said screws 15 are again tightened to lock the pivot screws 16 is selected adjusted positions.

The flexibility of the arms of the U-shaped sprmg 11 automatically compensates for wear of the adjustablepivot screws 16, and allows for greater freedom of movement of the stylus-holder 8, relative to the sound box 5, than is possible with mountings now in use, thereby ensuring much clearer tone and generally improved reproduction.

In the construction illustrated in Figurel of the drawings, the arms of the U-shaped spring 11 are sound-insulated from the adjus-table pivot screws 16 by means of pads 17 or alternatively strips of rubber or like non-resonant material, whereby the transmission of any extraneous sounds or vibrations to the stylus 9, stylus-holder 8 and stylus-bar 7 is entirely eliminated.

According to the modification illustrated by Figure 5, the adjustable pivot screws 16 and the locking screws 15 are dispensed with, and small bolts 18 having adjusting nuts 19 are employed in lieu thereof. In this construction the lugs 14 need not necessarily be" split, but can be tapped as shown toaccom modate the readily adjustable bolts 18.

Modifications in constructional details, in

design and in arrangement may be made' within the ambit of the invention as defined by the following claims. What I do claim is In a mounting for a stylus holder on a sound box, a sound box having parallel spaced lugs extending laterally therefrom, a block having a recess for mounting a stylus therein, a stylus bar fixed in and carried by the block, a U-sheped member of resilient material having the legs diverging from the connecting portion thereof, pivots adjustably carried by the sound box lugs for engagement of the ends of the legs of the U- shaped member to pivotally support the 

